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If a square model has main square 16p², two strips 20p and 20p, and corner 25, what is the outer side?

Answer and explanation

Correct answer: 4p+5

The direct answer is A. The main square has area 16p²=(4p)², so its side is 4p. The corner square has area 25=5², so its side is 5. In the model, the outer side is the sum of these adjacent lengths: 4p+5. This also checks by the identity (4p+5)²=16p²+40p+25, where the two strips contribute 20p+20p=40p. B adds areas as if they were lengths. C doubles the strip width and therefore gives the wrong outer side. D incorrectly uses 8p instead of the square root 4p. Memory cue: when a square area is given, take its square root to recover the side before adding lengths.

Related tags

Algebraic IdentitiesVisual SquareSide IdentificationVisual Models Of IdentitiesExploring Algebraic IdentitiesMathematicsClass 9 Mcq

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